Which of the following anion has the smallest radius?

1. H^-

2. F^-

3. Cl^-

4. Br^-

The first, second and third ionisation energies (E1, E2 and E3) for an element are 7 eV, 12.5 eV and 42.5 eV respectively. The most stable oxidation state of the element will be:

1. +1

2. +4

3. +3

4. +2

The order of ionisation potential between He⁺ ion and H-atom (both species are in gaseous state) is:

1. I.P. (He⁺) = I.P. (H)

2. I.P. (He⁺) < I.P. (H)

3. I.P. (He⁺) > I.P. (H)

4. cannot be compared

Second ionization potential of Li, Be and B is in the order:

1. Li > Be > B

2. Li > B > Be

3. Be > Li > B

4. B > Be > Li

Consider the following four elements, which are represented according to the long form of periodic table:

Here W, Y and Z are left, up and right elements with respect to the element 'X' and 'X' belongs to 16th group and 3rd period. Then according to given information the incorrect statement regarding given elements is:

1. Maximum electronegativity : Y

2. Maximum catenation property : X

3. Maximum electron affinity : Z

4. Y exhibits variable covalency

What is the atomic number of the element with the maximum number of unpaired 4p electrons?

The set representing the correct order of ionic radius is:

1. ${\mathrm{Na}}^{+}>{\mathrm{Mg}}^{2+}>{\mathrm{Al}}^{3+}>{\mathrm{Li}}^{+}>{\mathrm{Be}}^{2+}$

2. ${\mathrm{Na}}^{+}>{\mathrm{Li}}^{+}>{\mathrm{Mg}}^{2+}>{\mathrm{Al}}^{3+}>{\mathrm{Be}}^{2+}$

3. ${\mathrm{Na}}^{+}>{\mathrm{Mg}}^{2+}>{\mathrm{Li}}^{+}>{\mathrm{Al}}^{3+}>{\mathrm{Be}}^{2+}$

4. ${\mathrm{Na}}^{+}>{\mathrm{Mg}}^{2+}>{\mathrm{Li}}^{+}>{\mathrm{Be}}^{2+}$

${\mathrm{X}}_{\left(\mathrm{g}\right)}\to {{\mathrm{X}}^{+}}_{\left(\mathrm{g}\right)}+{\mathrm{e}}^{-},<mspace\; width="1em"></mspace>△\mathrm{H}=+720<mspace\; width="1em"></mspace>\mathrm{kJ}<mspace\; width="1em"></mspace>{\mathrm{mol}}^{-1}$

Calculate the amount of energy required to convert 110 mg of 'X' atom in gaseous state into X⁺ ion. (Atomic wt. for X=7 g/mol)

1. 10.4 kJ

2. 12.3 kJ

3. 11.3 kJ

4. 14.5 kJ

Which of the following orders of ionic radii is correctly represented?

A pair among the following that have the same size is:

1. Fe³⁺, Ni²⁺

2. Zr⁴⁺, Ti⁴⁺

3. Zr⁴⁺ , Hf⁴⁺

4. Zn²⁺, Hf⁴⁺